Baskervilles • Lesson 10 C1 Advanced / C2 Proficiency ⏱ 20 Mins

Lesson 10: The Mystery at Baskerville Hall

Master past modals of deduction (must have been, can't have, might well have) and analytical vocabulary (plausible, circumstantial) as Sherlock Holmes investigates the death of Sir Charles Baskerville.

Lesson Score
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Chapters 2–3 • 221B Baker Street The Death of Sir Charles Baskerville (1901)
What You'll Learn in This Lesson

Making Logical Deductions About the Past

1. Logical Certainty (must have + V3 / been V-ing) When the evidence points to one conclusion → "He must have been waiting for someone at the gate."
2. Logical Impossibility (can't / couldn't have + V3) When something is logically impossible (never use mustn't have!) → "It can't have been a coincidence."
3. Strong Possibility (may / might well have + V3) When a theory is very plausible → "Sudden terror might well have triggered his heart attack."

1. Read the Scene & Useful Vocabulary

Baskervilles • Chapters 2–3

In 221B Baker Street, Dr Mortimer reads out the newspaper report of Sir Charles Baskerville's sudden death in the Yew Alley—and reveals the one detail the butler kept secret at the inquest:

Original Novel Extract (1901)
"'The gates of the Yew Alley were open, and the footprints of Sir Charles were traceable down the damp walk. He seemed to have stood by the little wicket-gate for five or ten minutes, for the cigar ash had twice dropped from his cigar... Beyond the gate, however, the character of his footprints changed completely: he had run upon his toes, as a man runs who is in mortal dread of his life.'

Holmes leaned forward eagerly. 'And why was he running?'
'Barrymore declared at the inquest that there were no other traces on the ground,' said Dr Mortimer. 'He did not observe them. But I did—some little distance off, but fresh and clear.'
'Footprints?'
'Footprints.'
'A man's or a woman's?'
Dr Mortimer looked strangely at us for an instant, and his voice sank almost to a whisper as he answered: 'Mr Holmes, they were the footprints of a gigantic hound!'" — Sir Arthur Conan Doyle, The Hound of the Baskervilles (1901), Chapters 2–3 Original Text
Old-Fashioned Words (Just for Reading) 1901 Terms
19th-century countryside and medical terms from Chapters 2–3.
Moor-gate / Wicket-gate [noun] A small wooden pedestrian gate set into a hedge or wall leading out onto the open moor.
Scion [noun, literary] A descendant of a wealthy or noble family ("the last scion of the Baskervilles"). In modern English, write heir or descendant.
Spectral [adjective, literary] Ghostly or phantom-like. Great in a ghost story, rarely needed in formal essays.
Modern C1/C2 Words (Great for Exams) Use in Writing & Speaking
High-value analytical words for evaluating arguments and evidence in C1/C2 and IELTS essays.
Plausible [adjective] / Implausible [adj] Seeming reasonable or probable. Collocations: a plausible explanation, a plausible alternative.
Circumstantial [adjective] Pointing indirectly toward a conclusion without proving it directly. Collocations: based on circumstantial evidence.
Calamity [noun] An event causing sudden and widespread damage or distress; a disaster. Collocations: an economic calamity, avert a calamity.
Task 1: Vocabulary Check (4 Marks). Classify each word as a Modern C1/C2 Word or an Old-Fashioned Word:

2. The Grammar Pattern: Past Modals of Deduction

C1/C2 Speculation & Evidence

Like Sherlock Holmes weighing up clues, C1/C2 writers use past modals to show how certain they are about what happened in the past. Watch the difference between must have, can't have, and should have:

1. Strong Positive Deduction: must have + V3

Use must have + past participle (or must have been + -ing) when the evidence makes you 95% sure:

• The ash dropped twice, so Sir Charles must have been waiting for someone at the gate.

2. Negative Deduction: can't / couldn't have + V3

When something in the past is logically impossible, use can't have or couldn't have—NEVER mustn't have!

• ✓ The footprints were twenty yards away, so the hound can't have touched him.
• ✗ The hound mustn't have touched him.

3. Plausible Theory: may / might well have + V3

Adding well after may, might, or could upgrades a weak guess into a very plausible explanation:

• The sudden shock might well have triggered his fatal heart attack.

4. Criticism vs. Deduction: should have + V3

Remember: should have + V3 criticises a mistake (something that didn't happen); it is not for logical deduction:

• Sir Charles should never have walked down the Yew Alley alone at night. (= He did walk there, and it was a mistake.)

Quick Grammar Check (3 Marks):

5. Which sentence correctly expresses that it is logically impossible that Sir Charles walked calmly down the path?
6. Why does Holmes say "He must have been waiting by the gate for ten minutes" instead of "He must have waited..."?
7. What does adding the adverb well do in: "Rising living costs may well have contributed to the drop in birth rates"?

3. Cambridge Use of English Part 4: Key Word Transformations

2 Marks Each (10 Marks Total)

Complete the second sentence so that it has a similar meaning to the first sentence, using the word given. Do not change the word given. Use between 3 and 8 words, including the key word.

8. Based on the cigar ash, Holmes was certain that Sir Charles had been waiting for someone at the gate.
WAITING
Based on the cigar ash, Sir Charles at the gate.
9. It is logically impossible that the giant footprints near the alley were just a coincidence.
COINCIDENCE
It giant footprints were found near the alley.
10. Nobody could offer a reasonable explanation for why Sir Charles stood out in the cold rain.
PLAUSIBLE
There was Sir Charles stood out in the cold rain.
11. It is very likely that Sir Charles's heart attack was brought on by sudden terror.
WELL
Sir Charles's heart attack by sudden terror.
12. Holmes refused to jump to conclusions when there was only indirect evidence.
CIRCUMSTANTIAL
Holmes refused to jump to conclusions alone.

4. From Classic Fiction to Modern Exam Writing

Real-World C1/C2 Application

See how Holmes's deductive grammar (must have been, can't have, may well have) and words like plausible and circumstantial work naturally in a modern IELTS or Cambridge C1/C2 essay:

In Holmes's Investigation (1901)
"'The ash dropped twice from his cigar, so he must have been waiting by the gate. It cannot have been a mere coincidence that a giant hound's tracks were found nearby—the sight may well have triggered his fatal collapse.'"
In a Modern C1/C2 Essay on History, Science & Policy
"While early historians relied on circumstantial evidence to explain why ancient cities were abandoned, modern climate data offers a far more plausible explanation. Prolonged drought may well have forced farming communities to migrate, as crop failures alone cannot have been a coincidence across an entire region."

Modern Exam Writing Practice (Questions 13–15 • 3 Marks)

Choose the most natural, accurate C1/C2 sentence for a modern essay or report: